[DOC] add duration syntax
[DOC] start the admin plugin doc
[DOC] add a readme file for the user_documentation folder
[admin] the message given by the !admins command when no admins are online can now be customised in the admin plugin config file
Merge pull request #41 from thomasleveil/release-1.10

[DOC] start user documentation for the admin plugin
Merge pull request #42 from thomasleveil/admins_no_admins

[admin] the message given by the !admins command when no admins are onli...
[DOC] formatting
[DOC] formatting
[admin] the message given by the !aliases command when no aliases are found can now be customised in the admin plugin config file, as well as the message suffix when there are more than 10 aliases found
Also add user documentation for commands :
- admintest
- aliases
- leveltest
- regtest
[DOC] formatting
[admin] the message "Invalid parameters" can be change in the admin plugin config file
[admin] the message "ERROR: You must supply a reason" can be change in the admin plugin config file
[admin] the message "...is a masked higher level player..." can be change in the admin plugin config file
[admin] messages for command !baninfo can be customized in the admin plugin config file
[admin] messages 'unknown group' and 'group is beyond your reach' can be customized in the admin plugin config file
[admin] fix bug in the !putgroup command when given an extra parameter
[DOC] document commands b3, ban, banall, baninfo
[ADMIN] new messages in config file : cleared_warnings, cleared_warnings_for_all, warn_too_fast for commands !warn and !clear.
[ADMIN] Settings warn:warn_delay, warn:instant_kick_num and warn:alert_kick_num are now validated when the plugin config file is loaded and default values applied if there are any errors.
[TESTS] Added tests for commands !warn and !clear
[DOC] Added user doc for commands !clientinfo and !clear
[DOC] Added default command level and alias info to commands for the admin plugin user doc